Was bestimmt die Konzentration von Aerosolpartikeln in der marinen Grenzschicht über dem atlantischen Ozean?
Zusammenfassung der Projektergebnisse
In the marine environment of the ACORES archipelago vertical profiles (16 measurement flights) of aerosol number size distributions and number concentration around Graciosa Island as well as almost a full month (July 2017) of aerosol data at the ARM site ENA (sea level, Graciosa island) and the 2225m asl mountain site Pico Mountain (OMP, Pico island) were collected along with a full suite of meteorological and cloud parameters. On Pico Mountain a typical monomodal aerosol number size distribution with the maximum concentration between 50 and 200 nm most of the time was observed. In direct comparison, the number size distribution measured at ENA showed the typical bimodal shape with no obvious connection to the free troposphere. Specific case studies, such as the occurrence of a cloud and the formation of new particles were observed at the mountain site. The vertical profiles measured with the helicopter-borne platform ACTOS include situations with lowlevel clouds but also cloud-free cases. The flight pattern was chosen according to the meteorological situation and thus, cloud-free days were dedicated as aerosol flights, where the vertical structure and vertical transport was the focus of the flight. These days were ideal cases to estimate the vertical turbulent transport of aerosol particles and three different methods were applied for the first time to such data. In combination with CCN measurements the data can also be used to study aerosol cloud interaction directly when combining measurement inside and outside of cloud. Furthermore, new particle formation has been observed on top of marine stratocumulus clouds several times and needs to be analysed in more detail in the future. Here, a similar connection between cloud, radiation and aerosol formation (as in Wehner et al. 2015) might be the reason.
Projektbezogene Publikationen (Auswahl)
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Airborne investigation of the vertical layering and transport processes of aerosol particles in the marine boundary layer and the free troposphere over the Atlantic Ocean. 10th International Aerosol Conference (IAC 2018), St. Louis, MO, USA, 2-7 September 2018.
Wehner, B., Henning, S., Lauermann, F., Lückerath, J., Szodry, K.-E., Roberts, G. & Siebert, H.
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Fine-scale structure of the marine stratocumulus cloud top over the Azores. 15th Conference on Cloud Physics & 15th Conference on Atmospheric Radiation, Vancouver, BC, USA, 9-13 July 2018.
Szodry, K.-E., Fugal, J., Henning, S., Lauermann, F., Malinowski, S., Nowak, J., Shaw, R., Siebert, H., Stratmann, F., Wehner, B. & Wendisch, M.
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Free tropospheric aerosol characteristics over the North Eastern Atlantic Ocean and its relationship to the marine boundary layer. 10th International Aerosol Conference (IAC 2018), St. Louis, MO, USA, 2-7 September 2018.
Wehner, B., Chevalier, K., Henning, S., Weinhold, K., Welz, O., Mazzoleni, C., Fialho, P., Shum, S., Viviani, S. & Roberts, G.
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Increased particle concentrations on top of marine stratocumulus clouds over the Northeast Atlantic Ocean. European Aerosol Conference (EAC), Gothenburg, Sweden, 25-30 August 2019.
Wehner, B., Lückerath, J., Szodry, K.-E., Henning, S., Lauermann, F. & Siebert, H.
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Vertical aerosol particle exchange in the marine boundary layer estimated from helicopter-borne measurements in the Azores region. European Aerosol Conference (EAC), Gothenburg, Sweden, 25-30 August 2019.
Lückerath, J., Held, A. & Wehner, B.
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Vertical distribution of cloud condensation nuclei in marine air masses over the Northern Atlantic (ACORES Campaign). European Aerosol Conference (EAC), Gothenburg, Sweden, 25-30 August 2019.
Henning, S., Wehner, B., Roberts, G., Chevalier, K., Lückerath, J., Lauermann, F., Szodry, K.-E., Weinhold, K., Mazzoleni, C., Fialho, P., Schum, S. & Siebert, H.
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Quantifying the chemical mixing state index of atmospherically aged aerosols collected in the North Atlantic free troposphere. 2020 AGU Fall Meeting, Online, 1-17 December 2020.
Morgenstern, M., Brimberry, R., Lata, N. N., China, S., Mazzeloni, L. R., Fialho, P. J., Henning, S., Zhang, B., Wehner, B., Schum, S. K. & Mazzoleni, C.
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Cloud Condensation Nuclei and cloud droplet number concentrations in marine air masses over the Northern Atlantic (ACORES Campaign). 18th International Conference on Clouds and Precipitation (ICCP), Pune, India (online), 2-6 August 2021.
Henning, S., Wehner, B., Roberts, G., Nowak, J., Lückerath, J., Szodry, K.-E., Stratmann, F. & Siebert, H.
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Cloud Condensation Nuclei and Cloud droplet number concentrations over the Azores. European Aerosol Conference (EAC), Online, 30 August - 3 September 2021.
Henning, S., Schrödner, R., Wehner, B., Roberts, G., Nowak, J., Lückerath, J., Szodry, K.-E., Stratmann, F. & Siebert, H.
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Observations of Aerosol, Cloud, Turbulence, and Radiation Properties at the Top of the Marine Boundary Layer over the Eastern North Atlantic Ocean: The ACORES Campaign. Bulletin of the American Meteorological Society, 102(1), E123-E147.
Siebert, Holger; Szodry, Kai-Erik; Egerer, Ulrike; Wehner, Birgit; Henning, Silvia; Chevalier, Karine; Lückerath, Janine; Welz, Oliver; Weinhold, Kay; Lauermann, Felix; Gottschalk, Matthias; Ehrlich, André; Wendisch, Manfred; Fialho, Paulo; Roberts, Greg; Allwayin, Nithin; Schum, Simeon; Shaw, Raymond A.; Mazzoleni, Claudio ... & Mellado, Juan Pedro
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Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources. Atmospheric Chemistry and Physics, 22(13), 9033-9057.
Cheng, Zezhen; Morgenstern, Megan; Zhang, Bo; Fraund, Matthew; Lata, Nurun Nahar; Brimberry, Rhenton; Marcus, Matthew A.; Mazzoleni, Lynn; Fialho, Paulo; Henning, Silvia; Wehner, Birgit; Mazzoleni, Claudio & China, Swarup
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Vertical aerosol particle exchange in the marine boundary layer estimated from helicopter-borne measurements in the Azores region. Atmospheric Chemistry and Physics, 22(15), 10007-10021.
Lückerath, Janine; Held, Andreas; Siebert, Holger; Michalkow, Michel & Wehner, Birgit
